Protein Structure from Scientific Research

Network of residues from two adjacent SOI subunits in apo state. The electron densities for haem b are shown as surfaces. The electron densities of haem b are shown in a surface representation (map contoured at =15). In the apo state, an additional unknown density bound to haem b (shown as a white surface) is observed, which might correspond to a water molecule that mediates an interaction of Fe(III) and Y103 in the apo state.

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